Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dbdf523211a9870…

MALICIOUS

PDF

95.2 KB Created: 2021-07-08 11:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2c0ab490b3658225a35336891a6ca7a2 SHA-1: 5168105f111383ac3b6c93e8b6d41ed46b6aeed4 SHA-256: 6dbdf523211a987038a781eb1119ff0453f3f9f4bc7fc38b689fe37a2890233f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to external sites. The presence of multiple URLs, including one hosted on compromised WordPress infrastructure, reinforces the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://aokisuper.com/ckfinder/userfiles/files/rigiripipidewesemuzinoga.pdf In PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/tudub.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/4650298878f7dc7f513fdc195aff81a9/kosol.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89b0c0a19b---feditonisor.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/mejikuvewibegudodini.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/691639fdc4446cdb5ca9125715db5b0e/83292615601.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ddea62d9341---bodegabuwujeguva.pdfIn PDF document text
    • https://xn--8--clcp3bi.xn--p1ai/files/kopudipewosasupasononi.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16083b3a9a2a22---48472502630.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/milnl562l8enp8kedg9j49kai0/gujugijor.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759238b19fd---47784168271.pdfIn PDF document text
    • http://falerisztika.hu/tmp/93489132664.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/73406442036.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/f54d6a618ec54e87cf9c528e13a14540/rewupebebovaveduk.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/6a452bd3921fa7dec0127007fcd48a70/ratelew.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/35507249923.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/060e246e7c450671d4b156f3801c798b/guzego.pdfIn PDF document text
    • https://arerp.kr/data/file///26085871754.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/994537b3de1b68357bb5a4a1eaffb16e/13635178657.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/09jlvd03qrhteu7fbsggthni6q/46346511122.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/hl8ggnuenepc4tgl052tejooq0/vilewilevagoxaxop.pdfIn PDF document text
    • https://parc-hotel.info/file/43832425446.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/salelukeguvekeniwajananaw.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/hveder112025fqnkaf1269efg7/dajinowunefepupazogofuna.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7350498610---xijunoluxaxupo.pdfIn PDF document text
    • http://rsst77.ru/upload/files/21835855254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=expired+lottery+scratch+cardsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBC 10704 bytes
SHA-256: 05758f35b612844aaa6b3c3f6cf6fb23a58914acff53a8aab05444fca9b14971
font_01_sfnt_off00012875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12875 17668 bytes
SHA-256: ce39a068fbe455c73ffc08e479d79301b23103114410f9d87eb0be9c96abcfda
font_02_sfnt_off00015719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15719 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1